import {
  AmbientLight,
  AnimationClip,
  Bone,
  BufferAttribute,
  BufferGeometry,
  ClampToEdgeWrapping,
  Color,
  DirectionalLight,
  EquirectangularReflectionMapping,
  Euler,
  FileLoader,
  Float32BufferAttribute,
  Group,
  Line,
  LineBasicMaterial,
  Loader,
  LoaderUtils,
  MathUtils,
  Matrix3,
  Matrix4,
  Mesh,
  MeshLambertMaterial,
  MeshPhongMaterial,
  NumberKeyframeTrack,
  Object3D,
  OrthographicCamera,
  PerspectiveCamera,
  PointLight,
  PropertyBinding,
  Quaternion,
  QuaternionKeyframeTrack,
  RepeatWrapping,
  Skeleton,
  SkinnedMesh,
  SpotLight,
  Texture,
  TextureLoader,
  Uint16BufferAttribute,
  Vector3,
  Vector4,
  VectorKeyframeTrack,
  sRGBEncoding
} from "../../build/three.module.js";
import {Inflate} from "../libs/inflate.module.min.js";
import {NURBSCurve} from "../curves/NURBSCurve.js";

/**
 * Loader loads FBX file and generates Group representing FBX scene.
 * Requires FBX file to be >= 7.0 and in ASCII or >= 6400 in Binary format
 * Versions lower than this may load but will probably have errors
 *
 * Needs Support:
 *  Morph normals / blend shape normals
 *
 * FBX format references:
 *  https://wiki.blender.org/index.php/User:Mont29/Foundation/FBX_File_Structure
 *  http://help.autodesk.com/view/FBX/2017/ENU/?guid=__cpp_ref_index_html (C++ SDK reference)
 *
 *  Binary format specification:
 *    https://code.blender.org/2013/08/fbx-binary-file-format-specification/
 */


var FBXLoader = (function () {

  var fbxTree;
  var connections;
  var sceneGraph;

  function FBXLoader(manager) {

    Loader.call(this, manager);

  }

  FBXLoader.prototype = Object.assign(Object.create(Loader.prototype), {

    constructor: FBXLoader,

    load: function (url, onLoad, onProgress, onError) {

      var scope = this;

      var path = (scope.path === '') ? LoaderUtils.extractUrlBase(url) : scope.path;

      var loader = new FileLoader(this.manager);
      loader.setPath(scope.path);
      loader.setResponseType('arraybuffer');
      loader.setRequestHeader(scope.requestHeader);
      loader.setWithCredentials(scope.withCredentials);

      loader.load(url, function (buffer) {

        try {

          onLoad(scope.parse(buffer, path));

        } catch (e) {

          if (onError) {

            onError(e);

          } else {

            console.error(e);

          }

          scope.manager.itemError(url);

        }

      }, onProgress, onError);

    },

    parse: function (FBXBuffer, path) {

      if (isFbxFormatBinary(FBXBuffer)) {

        fbxTree = new BinaryParser().parse(FBXBuffer);

      } else {

        var FBXText = convertArrayBufferToString(FBXBuffer);

        if (!isFbxFormatASCII(FBXText)) {

          throw new Error('THREE.FBXLoader: Unknown format.');

        }

        if (getFbxVersion(FBXText) < 7000) {

          throw new Error('THREE.FBXLoader: FBX version not supported, FileVersion: ' + getFbxVersion(FBXText));

        }

        fbxTree = new TextParser().parse(FBXText);

      }

      // console.log( fbxTree );

      var textureLoader = new TextureLoader(this.manager).setPath(this.resourcePath || path).setCrossOrigin(this.crossOrigin);

      return new FBXTreeParser(textureLoader, this.manager).parse(fbxTree);

    }

  });

  // Parse the FBXTree object returned by the BinaryParser or TextParser and return a Group
  function FBXTreeParser(textureLoader, manager) {

    this.textureLoader = textureLoader;
    this.manager = manager;

  }

  FBXTreeParser.prototype = {

    constructor: FBXTreeParser,

    parse: function () {

      connections = this.parseConnections();

      var images = this.parseImages();
      var textures = this.parseTextures(images);
      var materials = this.parseMaterials(textures);
      var deformers = this.parseDeformers();
      var geometryMap = new GeometryParser().parse(deformers);

      this.parseScene(deformers, geometryMap, materials);

      return sceneGraph;

    },

    // Parses FBXTree.Connections which holds parent-child connections between objects (e.g. material -> texture, model->geometry )
    // and details the connection type
    parseConnections: function () {

      var connectionMap = new Map();

      if ('Connections' in fbxTree) {

        var rawConnections = fbxTree.Connections.connections;

        rawConnections.forEach(function (rawConnection) {

          var fromID = rawConnection[0];
          var toID = rawConnection[1];
          var relationship = rawConnection[2];

          if (!connectionMap.has(fromID)) {

            connectionMap.set(fromID, {
              parents: [],
              children: []
            });

          }

          var parentRelationship = {ID: toID, relationship: relationship};
          connectionMap.get(fromID).parents.push(parentRelationship);

          if (!connectionMap.has(toID)) {

            connectionMap.set(toID, {
              parents: [],
              children: []
            });

          }

          var childRelationship = {ID: fromID, relationship: relationship};
          connectionMap.get(toID).children.push(childRelationship);

        });

      }

      return connectionMap;

    },

    // Parse FBXTree.Objects.Video for embedded image data
    // These images are connected to textures in FBXTree.Objects.Textures
    // via FBXTree.Connections.
    parseImages: function () {

      var images = {};
      var blobs = {};

      if ('Video' in fbxTree.Objects) {

        var videoNodes = fbxTree.Objects.Video;

        for (var nodeID in videoNodes) {

          var videoNode = videoNodes[nodeID];

          var id = parseInt(nodeID);

          images[id] = videoNode.RelativeFilename || videoNode.Filename;

          // raw image data is in videoNode.Content
          if ('Content' in videoNode) {

            var arrayBufferContent = (videoNode.Content instanceof ArrayBuffer) && (videoNode.Content.byteLength > 0);
            var base64Content = (typeof videoNode.Content === 'string') && (videoNode.Content !== '');

            if (arrayBufferContent || base64Content) {

              var image = this.parseImage(videoNodes[nodeID]);

              blobs[videoNode.RelativeFilename || videoNode.Filename] = image;

            }

          }

        }

      }

      for (var id in images) {

        var filename = images[id];

        if (blobs[filename] !== undefined) images[id] = blobs[filename];
        else images[id] = images[id].split('\\').pop();

      }

      return images;

    },

    // Parse embedded image data in FBXTree.Video.Content
    parseImage: function (videoNode) {

      var content = videoNode.Content;
      var fileName = videoNode.RelativeFilename || videoNode.Filename;
      var extension = fileName.slice(fileName.lastIndexOf('.') + 1).toLowerCase();

      var type;

      switch (extension) {

        case 'bmp':

          type = 'image/bmp';
          break;

        case 'jpg':
        case 'jpeg':

          type = 'image/jpeg';
          break;

        case 'png':

          type = 'image/png';
          break;

        case 'tif':

          type = 'image/tiff';
          break;

        case 'tga':

          if (this.manager.getHandler('.tga') === null) {

            console.warn('FBXLoader: TGA loader not found, skipping ', fileName);

          }

          type = 'image/tga';
          break;

        default:

          console.warn('FBXLoader: Image type "' + extension + '" is not supported.');
          return;

      }

      if (typeof content === 'string') { // ASCII format

        return 'data:' + type + ';base64,' + content;

      } else { // Binary Format

        var array = new Uint8Array(content);
        return window.URL.createObjectURL(new Blob([array], {type: type}));

      }

    },

    // Parse nodes in FBXTree.Objects.Texture
    // These contain details such as UV scaling, cropping, rotation etc and are connected
    // to images in FBXTree.Objects.Video
    parseTextures: function (images) {

      var textureMap = new Map();

      if ('Texture' in fbxTree.Objects) {

        var textureNodes = fbxTree.Objects.Texture;
        for (var nodeID in textureNodes) {

          var texture = this.parseTexture(textureNodes[nodeID], images);
          textureMap.set(parseInt(nodeID), texture);

        }

      }

      return textureMap;

    },

    // Parse individual node in FBXTree.Objects.Texture
    parseTexture: function (textureNode, images) {

      var texture = this.loadTexture(textureNode, images);

      texture.ID = textureNode.id;

      texture.name = textureNode.attrName;

      var wrapModeU = textureNode.WrapModeU;
      var wrapModeV = textureNode.WrapModeV;

      var valueU = wrapModeU !== undefined ? wrapModeU.value : 0;
      var valueV = wrapModeV !== undefined ? wrapModeV.value : 0;

      // http://download.autodesk.com/us/fbx/SDKdocs/FBX_SDK_Help/files/fbxsdkref/class_k_fbx_texture.html#889640e63e2e681259ea81061b85143a
      // 0: repeat(default), 1: clamp

      texture.wrapS = valueU === 0 ? RepeatWrapping : ClampToEdgeWrapping;
      texture.wrapT = valueV === 0 ? RepeatWrapping : ClampToEdgeWrapping;

      if ('Scaling' in textureNode) {

        var values = textureNode.Scaling.value;

        texture.repeat.x = values[0];
        texture.repeat.y = values[1];

      }

      return texture;

    },

    // load a texture specified as a blob or data URI, or via an external URL using TextureLoader
    loadTexture: function (textureNode, images) {

      var fileName;

      var currentPath = this.textureLoader.path;

      var children = connections.get(textureNode.id).children;

      if (children !== undefined && children.length > 0 && images[children[0].ID] !== undefined) {

        fileName = images[children[0].ID];

        if (fileName.indexOf('blob:') === 0 || fileName.indexOf('data:') === 0) {

          this.textureLoader.setPath(undefined);

        }

      }

      var texture;

      var extension = textureNode.FileName.slice(-3).toLowerCase();

      if (extension === 'tga') {

        var loader = this.manager.getHandler('.tga');

        if (loader === null) {

          console.warn('FBXLoader: TGA loader not found, creating placeholder texture for', textureNode.RelativeFilename);
          texture = new Texture();

        } else {

          texture = loader.load(fileName);

        }

      } else if (extension === 'psd') {

        console.warn('FBXLoader: PSD textures are not supported, creating placeholder texture for', textureNode.RelativeFilename);
        texture = new Texture();

      } else {

        texture = this.textureLoader.load(fileName);

      }

      this.textureLoader.setPath(currentPath);

      return texture;

    },

    // Parse nodes in FBXTree.Objects.Material
    parseMaterials: function (textureMap) {

      var materialMap = new Map();

      if ('Material' in fbxTree.Objects) {

        var materialNodes = fbxTree.Objects.Material;

        for (var nodeID in materialNodes) {

          var material = this.parseMaterial(materialNodes[nodeID], textureMap);

          if (material !== null) materialMap.set(parseInt(nodeID), material);

        }

      }

      return materialMap;

    },

    // Parse single node in FBXTree.Objects.Material
    // Materials are connected to texture maps in FBXTree.Objects.Textures
    // FBX format currently only supports Lambert and Phong shading models
    parseMaterial: function (materialNode, textureMap) {

      var ID = materialNode.id;
      var name = materialNode.attrName;
      var type = materialNode.ShadingModel;

      // Case where FBX wraps shading model in property object.
      if (typeof type === 'object') {

        type = type.value;

      }

      // Ignore unused materials which don't have any connections.
      if (!connections.has(ID)) return null;

      var parameters = this.parseParameters(materialNode, textureMap, ID);

      var material;

      switch (type.toLowerCase()) {

        case 'phong':
          material = new MeshPhongMaterial();
          break;
        case 'lambert':
          material = new MeshLambertMaterial();
          break;
        default:
          console.warn('THREE.FBXLoader: unknown material type "%s". Defaulting to MeshPhongMaterial.', type);
          material = new MeshPhongMaterial();
          break;

      }

      material.setValues(parameters);
      material.name = name;

      return material;

    },

    // Parse FBX material and return parameters suitable for a three.js material
    // Also parse the texture map and return any textures associated with the material
    parseParameters: function (materialNode, textureMap, ID) {

      var parameters = {};

      if (materialNode.BumpFactor) {

        parameters.bumpScale = materialNode.BumpFactor.value;

      }

      if (materialNode.Diffuse) {

        parameters.color = new Color().fromArray(materialNode.Diffuse.value);

      } else if (materialNode.DiffuseColor && materialNode.DiffuseColor.type === 'Color') {

        // The blender exporter exports diffuse here instead of in materialNode.Diffuse
        parameters.color = new Color().fromArray(materialNode.DiffuseColor.value);

      }

      if (materialNode.DisplacementFactor) {

        parameters.displacementScale = materialNode.DisplacementFactor.value;

      }

      if (materialNode.Emissive) {

        parameters.emissive = new Color().fromArray(materialNode.Emissive.value);

      } else if (materialNode.EmissiveColor && materialNode.EmissiveColor.type === 'Color') {

        // The blender exporter exports emissive color here instead of in materialNode.Emissive
        parameters.emissive = new Color().fromArray(materialNode.EmissiveColor.value);

      }

      if (materialNode.EmissiveFactor) {

        parameters.emissiveIntensity = parseFloat(materialNode.EmissiveFactor.value);

      }

      if (materialNode.Opacity) {

        parameters.opacity = parseFloat(materialNode.Opacity.value);

      }

      if (parameters.opacity < 1.0) {

        parameters.transparent = true;

      }

      if (materialNode.ReflectionFactor) {

        parameters.reflectivity = materialNode.ReflectionFactor.value;

      }

      if (materialNode.Shininess) {

        parameters.shininess = materialNode.Shininess.value;

      }

      if (materialNode.Specular) {

        parameters.specular = new Color().fromArray(materialNode.Specular.value);

      } else if (materialNode.SpecularColor && materialNode.SpecularColor.type === 'Color') {

        // The blender exporter exports specular color here instead of in materialNode.Specular
        parameters.specular = new Color().fromArray(materialNode.SpecularColor.value);

      }

      var scope = this;
      connections.get(ID).children.forEach(function (child) {

        var type = child.relationship;

        switch (type) {

          case 'Bump':
            parameters.bumpMap = scope.getTexture(textureMap, child.ID);
            break;

          case 'Maya|TEX_ao_map':
            parameters.aoMap = scope.getTexture(textureMap, child.ID);
            break;

          case 'DiffuseColor':
          case 'Maya|TEX_color_map':
            parameters.map = scope.getTexture(textureMap, child.ID);
            parameters.map.encoding = sRGBEncoding;
            break;

          case 'DisplacementColor':
            parameters.displacementMap = scope.getTexture(textureMap, child.ID);
            break;

          case 'EmissiveColor':
            parameters.emissiveMap = scope.getTexture(textureMap, child.ID);
            parameters.emissiveMap.encoding = sRGBEncoding;
            break;

          case 'NormalMap':
          case 'Maya|TEX_normal_map':
            parameters.normalMap = scope.getTexture(textureMap, child.ID);
            break;

          case 'ReflectionColor':
            parameters.envMap = scope.getTexture(textureMap, child.ID);
            parameters.envMap.mapping = EquirectangularReflectionMapping;
            parameters.envMap.encoding = sRGBEncoding;
            break;

          case 'SpecularColor':
            parameters.specularMap = scope.getTexture(textureMap, child.ID);
            parameters.specularMap.encoding = sRGBEncoding;
            break;

          case 'TransparentColor':
          case 'TransparencyFactor':
            parameters.alphaMap = scope.getTexture(textureMap, child.ID);
            parameters.transparent = true;
            break;

          case 'AmbientColor':
          case 'ShininessExponent': // AKA glossiness map
          case 'SpecularFactor': // AKA specularLevel
          case 'VectorDisplacementColor': // NOTE: Seems to be a copy of DisplacementColor
          default:
            console.warn('THREE.FBXLoader: %s map is not supported in three.js, skipping texture.', type);
            break;

        }

      });

      return parameters;

    },

    // get a texture from the textureMap for use by a material.
    getTexture: function (textureMap, id) {

      // if the texture is a layered texture, just use the first layer and issue a warning
      if ('LayeredTexture' in fbxTree.Objects && id in fbxTree.Objects.LayeredTexture) {

        console.warn('THREE.FBXLoader: layered textures are not supported in three.js. Discarding all but first layer.');
        id = connections.get(id).children[0].ID;

      }

      return textureMap.get(id);

    },

    // Parse nodes in FBXTree.Objects.Deformer
    // Deformer node can contain skinning or Vertex Cache animation data, however only skinning is supported here
    // Generates map of Skeleton-like objects for use later when generating and binding skeletons.
    parseDeformers: function () {

      var skeletons = {};
      var morphTargets = {};

      if ('Deformer' in fbxTree.Objects) {

        var DeformerNodes = fbxTree.Objects.Deformer;

        for (var nodeID in DeformerNodes) {

          var deformerNode = DeformerNodes[nodeID];

          var relationships = connections.get(parseInt(nodeID));

          if (deformerNode.attrType === 'Skin') {

            var skeleton = this.parseSkeleton(relationships, DeformerNodes);
            skeleton.ID = nodeID;

            if (relationships.parents.length > 1) console.warn('THREE.FBXLoader: skeleton attached to more than one geometry is not supported.');
            skeleton.geometryID = relationships.parents[0].ID;

            skeletons[nodeID] = skeleton;

          } else if (deformerNode.attrType === 'BlendShape') {

            var morphTarget = {
              id: nodeID,
            };

            morphTarget.rawTargets = this.parseMorphTargets(relationships, DeformerNodes);
            morphTarget.id = nodeID;

            if (relationships.parents.length > 1) console.warn('THREE.FBXLoader: morph target attached to more than one geometry is not supported.');

            morphTargets[nodeID] = morphTarget;

          }

        }

      }

      return {

        skeletons: skeletons,
        morphTargets: morphTargets,

      };

    },

    // Parse single nodes in FBXTree.Objects.Deformer
    // The top level skeleton node has type 'Skin' and sub nodes have type 'Cluster'
    // Each skin node represents a skeleton and each cluster node represents a bone
    parseSkeleton: function (relationships, deformerNodes) {

      var rawBones = [];

      relationships.children.forEach(function (child) {

        var boneNode = deformerNodes[child.ID];

        if (boneNode.attrType !== 'Cluster') return;

        var rawBone = {

          ID: child.ID,
          indices: [],
          weights: [],
          transformLink: new Matrix4().fromArray(boneNode.TransformLink.a),
          // transform: new Matrix4().fromArray( boneNode.Transform.a ),
          // linkMode: boneNode.Mode,

        };

        if ('Indexes' in boneNode) {

          rawBone.indices = boneNode.Indexes.a;
          rawBone.weights = boneNode.Weights.a;

        }

        rawBones.push(rawBone);

      });

      return {

        rawBones: rawBones,
        bones: []

      };

    },

    // The top level morph deformer node has type "BlendShape" and sub nodes have type "BlendShapeChannel"
    parseMorphTargets: function (relationships, deformerNodes) {

      var rawMorphTargets = [];

      for (var i = 0; i < relationships.children.length; i++) {

        var child = relationships.children[i];

        var morphTargetNode = deformerNodes[child.ID];

        var rawMorphTarget = {

          name: morphTargetNode.attrName,
          initialWeight: morphTargetNode.DeformPercent,
          id: morphTargetNode.id,
          fullWeights: morphTargetNode.FullWeights.a

        };

        if (morphTargetNode.attrType !== 'BlendShapeChannel') return;

        rawMorphTarget.geoID = connections.get(parseInt(child.ID)).children.filter(function (child) {

          return child.relationship === undefined;

        })[0].ID;

        rawMorphTargets.push(rawMorphTarget);

      }

      return rawMorphTargets;

    },

    // create the main Group() to be returned by the loader
    parseScene: function (deformers, geometryMap, materialMap) {

      sceneGraph = new Group();

      var modelMap = this.parseModels(deformers.skeletons, geometryMap, materialMap);

      var modelNodes = fbxTree.Objects.Model;

      var scope = this;
      modelMap.forEach(function (model) {

        var modelNode = modelNodes[model.ID];
        scope.setLookAtProperties(model, modelNode);

        var parentConnections = connections.get(model.ID).parents;

        parentConnections.forEach(function (connection) {

          var parent = modelMap.get(connection.ID);
          if (parent !== undefined) parent.add(model);

        });

        if (model.parent === null) {

          sceneGraph.add(model);

        }


      });

      this.bindSkeleton(deformers.skeletons, geometryMap, modelMap);

      this.createAmbientLight();

      this.setupMorphMaterials();

      sceneGraph.traverse(function (node) {

        if (node.userData.transformData) {

          if (node.parent) node.userData.transformData.parentMatrixWorld = node.parent.matrix;

          var transform = generateTransform(node.userData.transformData);

          node.applyMatrix4(transform);

        }

      });

      var animations = new AnimationParser().parse();

      // if all the models where already combined in a single group, just return that
      if (sceneGraph.children.length === 1 && sceneGraph.children[0].isGroup) {

        sceneGraph.children[0].animations = animations;
        sceneGraph = sceneGraph.children[0];

      }

      sceneGraph.animations = animations;

    },

    // parse nodes in FBXTree.Objects.Model
    parseModels: function (skeletons, geometryMap, materialMap) {

      var modelMap = new Map();
      var modelNodes = fbxTree.Objects.Model;

      for (var nodeID in modelNodes) {

        var id = parseInt(nodeID);
        var node = modelNodes[nodeID];
        var relationships = connections.get(id);

        var model = this.buildSkeleton(relationships, skeletons, id, node.attrName);

        if (!model) {

          switch (node.attrType) {

            case 'Camera':
              model = this.createCamera(relationships);
              break;
            case 'Light':
              model = this.createLight(relationships);
              break;
            case 'Mesh':
              model = this.createMesh(relationships, geometryMap, materialMap);
              break;
            case 'NurbsCurve':
              model = this.createCurve(relationships, geometryMap);
              break;
            case 'LimbNode':
            case 'Root':
              model = new Bone();
              break;
            case 'Null':
            default:
              model = new Group();
              break;

          }

          model.name = node.attrName ? PropertyBinding.sanitizeNodeName(node.attrName) : '';

          model.ID = id;

        }

        this.getTransformData(model, node);
        modelMap.set(id, model);

      }

      return modelMap;

    },

    buildSkeleton: function (relationships, skeletons, id, name) {

      var bone = null;

      relationships.parents.forEach(function (parent) {

        for (var ID in skeletons) {

          var skeleton = skeletons[ID];

          skeleton.rawBones.forEach(function (rawBone, i) {

            if (rawBone.ID === parent.ID) {

              var subBone = bone;
              bone = new Bone();

              bone.matrixWorld.copy(rawBone.transformLink);

              // set name and id here - otherwise in cases where "subBone" is created it will not have a name / id

              bone.name = name ? PropertyBinding.sanitizeNodeName(name) : '';
              bone.ID = id;

              skeleton.bones[i] = bone;

              // In cases where a bone is shared between multiple meshes
              // duplicate the bone here and and it as a child of the first bone
              if (subBone !== null) {

                bone.add(subBone);

              }

            }

          });

        }

      });

      return bone;

    },

    // create a PerspectiveCamera or OrthographicCamera
    createCamera: function (relationships) {

      var model;
      var cameraAttribute;

      relationships.children.forEach(function (child) {

        var attr = fbxTree.Objects.NodeAttribute[child.ID];

        if (attr !== undefined) {

          cameraAttribute = attr;

        }

      });

      if (cameraAttribute === undefined) {

        model = new Object3D();

      } else {

        var type = 0;
        if (cameraAttribute.CameraProjectionType !== undefined && cameraAttribute.CameraProjectionType.value === 1) {

          type = 1;

        }

        var nearClippingPlane = 1;
        if (cameraAttribute.NearPlane !== undefined) {

          nearClippingPlane = cameraAttribute.NearPlane.value / 1000;

        }

        var farClippingPlane = 1000;
        if (cameraAttribute.FarPlane !== undefined) {

          farClippingPlane = cameraAttribute.FarPlane.value / 1000;

        }


        var width = window.innerWidth;
        var height = window.innerHeight;

        if (cameraAttribute.AspectWidth !== undefined && cameraAttribute.AspectHeight !== undefined) {

          width = cameraAttribute.AspectWidth.value;
          height = cameraAttribute.AspectHeight.value;

        }

        var aspect = width / height;

        var fov = 45;
        if (cameraAttribute.FieldOfView !== undefined) {

          fov = cameraAttribute.FieldOfView.value;

        }

        var focalLength = cameraAttribute.FocalLength ? cameraAttribute.FocalLength.value : null;

        switch (type) {

          case 0: // Perspective
            model = new PerspectiveCamera(fov, aspect, nearClippingPlane, farClippingPlane);
            if (focalLength !== null) model.setFocalLength(focalLength);
            break;

          case 1: // Orthographic
            model = new OrthographicCamera(-width / 2, width / 2, height / 2, -height / 2, nearClippingPlane, farClippingPlane);
            break;

          default:
            console.warn('THREE.FBXLoader: Unknown camera type ' + type + '.');
            model = new Object3D();
            break;

        }

      }

      return model;

    },

    // Create a DirectionalLight, PointLight or SpotLight
    createLight: function (relationships) {

      var model;
      var lightAttribute;

      relationships.children.forEach(function (child) {

        var attr = fbxTree.Objects.NodeAttribute[child.ID];

        if (attr !== undefined) {

          lightAttribute = attr;

        }

      });

      if (lightAttribute === undefined) {

        model = new Object3D();

      } else {

        var type;

        // LightType can be undefined for Point lights
        if (lightAttribute.LightType === undefined) {

          type = 0;

        } else {

          type = lightAttribute.LightType.value;

        }

        var color = 0xffffff;

        if (lightAttribute.Color !== undefined) {

          color = new Color().fromArray(lightAttribute.Color.value);

        }

        var intensity = (lightAttribute.Intensity === undefined) ? 1 : lightAttribute.Intensity.value / 100;

        // light disabled
        if (lightAttribute.CastLightOnObject !== undefined && lightAttribute.CastLightOnObject.value === 0) {

          intensity = 0;

        }

        var distance = 0;
        if (lightAttribute.FarAttenuationEnd !== undefined) {

          if (lightAttribute.EnableFarAttenuation !== undefined && lightAttribute.EnableFarAttenuation.value === 0) {

            distance = 0;

          } else {

            distance = lightAttribute.FarAttenuationEnd.value;

          }

        }

        // TODO: could this be calculated linearly from FarAttenuationStart to FarAttenuationEnd?
        var decay = 1;

        switch (type) {

          case 0: // Point
            model = new PointLight(color, intensity, distance, decay);
            break;

          case 1: // Directional
            model = new DirectionalLight(color, intensity);
            break;

          case 2: // Spot
            var angle = Math.PI / 3;

            if (lightAttribute.InnerAngle !== undefined) {

              angle = MathUtils.degToRad(lightAttribute.InnerAngle.value);

            }

            var penumbra = 0;
            if (lightAttribute.OuterAngle !== undefined) {

              // TODO: this is not correct - FBX calculates outer and inner angle in degrees
              // with OuterAngle > InnerAngle && OuterAngle <= Math.PI
              // while three.js uses a penumbra between (0, 1) to attenuate the inner angle
              penumbra = MathUtils.degToRad(lightAttribute.OuterAngle.value);
              penumbra = Math.max(penumbra, 1);

            }

            model = new SpotLight(color, intensity, distance, angle, penumbra, decay);
            break;

          default:
            console.warn('THREE.FBXLoader: Unknown light type ' + lightAttribute.LightType.value + ', defaulting to a PointLight.');
            model = new PointLight(color, intensity);
            break;

        }

        if (lightAttribute.CastShadows !== undefined && lightAttribute.CastShadows.value === 1) {

          model.castShadow = true;

        }

      }

      return model;

    },

    createMesh: function (relationships, geometryMap, materialMap) {

      var model;
      var geometry = null;
      var material = null;
      var materials = [];

      // get geometry and materials(s) from connections
      relationships.children.forEach(function (child) {

        if (geometryMap.has(child.ID)) {

          geometry = geometryMap.get(child.ID);

        }

        if (materialMap.has(child.ID)) {

          materials.push(materialMap.get(child.ID));

        }

      });

      if (materials.length > 1) {

        material = materials;

      } else if (materials.length > 0) {

        material = materials[0];

      } else {

        material = new MeshPhongMaterial({color: 0xcccccc});
        materials.push(material);

      }

      if ('color' in geometry.attributes) {

        materials.forEach(function (material) {

          material.vertexColors = true;

        });

      }

      if (geometry.FBX_Deformer) {

        materials.forEach(function (material) {

          material.skinning = true;

        });

        model = new SkinnedMesh(geometry, material);
        model.normalizeSkinWeights();

      } else {

        model = new Mesh(geometry, material);

      }

      return model;

    },

    createCurve: function (relationships, geometryMap) {

      var geometry = relationships.children.reduce(function (geo, child) {

        if (geometryMap.has(child.ID)) geo = geometryMap.get(child.ID);

        return geo;

      }, null);

      // FBX does not list materials for Nurbs lines, so we'll just put our own in here.
      var material = new LineBasicMaterial({color: 0x3300ff, linewidth: 1});
      return new Line(geometry, material);

    },

    // parse the model node for transform data
    getTransformData: function (model, modelNode) {

      var transformData = {};

      if ('InheritType' in modelNode) transformData.inheritType = parseInt(modelNode.InheritType.value);

      if ('RotationOrder' in modelNode) transformData.eulerOrder = getEulerOrder(modelNode.RotationOrder.value);
      else transformData.eulerOrder = 'ZYX';

      if ('Lcl_Translation' in modelNode) transformData.translation = modelNode.Lcl_Translation.value;

      if ('PreRotation' in modelNode) transformData.preRotation = modelNode.PreRotation.value;
      if ('Lcl_Rotation' in modelNode) transformData.rotation = modelNode.Lcl_Rotation.value;
      if ('PostRotation' in modelNode) transformData.postRotation = modelNode.PostRotation.value;

      if ('Lcl_Scaling' in modelNode) transformData.scale = modelNode.Lcl_Scaling.value;

      if ('ScalingOffset' in modelNode) transformData.scalingOffset = modelNode.ScalingOffset.value;
      if ('ScalingPivot' in modelNode) transformData.scalingPivot = modelNode.ScalingPivot.value;

      if ('RotationOffset' in modelNode) transformData.rotationOffset = modelNode.RotationOffset.value;
      if ('RotationPivot' in modelNode) transformData.rotationPivot = modelNode.RotationPivot.value;

      model.userData.transformData = transformData;

    },

    setLookAtProperties: function (model, modelNode) {

      if ('LookAtProperty' in modelNode) {

        var children = connections.get(model.ID).children;

        children.forEach(function (child) {

          if (child.relationship === 'LookAtProperty') {

            var lookAtTarget = fbxTree.Objects.Model[child.ID];

            if ('Lcl_Translation' in lookAtTarget) {

              var pos = lookAtTarget.Lcl_Translation.value;

              // DirectionalLight, SpotLight
              if (model.target !== undefined) {

                model.target.position.fromArray(pos);
                sceneGraph.add(model.target);

              } else { // Cameras and other Object3Ds

                model.lookAt(new Vector3().fromArray(pos));

              }

            }

          }

        });

      }

    },

    bindSkeleton: function (skeletons, geometryMap, modelMap) {

      var bindMatrices = this.parsePoseNodes();

      for (var ID in skeletons) {

        var skeleton = skeletons[ID];

        var parents = connections.get(parseInt(skeleton.ID)).parents;

        parents.forEach(function (parent) {

          if (geometryMap.has(parent.ID)) {

            var geoID = parent.ID;
            var geoRelationships = connections.get(geoID);

            geoRelationships.parents.forEach(function (geoConnParent) {

              if (modelMap.has(geoConnParent.ID)) {

                var model = modelMap.get(geoConnParent.ID);

                model.bind(new Skeleton(skeleton.bones), bindMatrices[geoConnParent.ID]);

              }

            });

          }

        });

      }

    },

    parsePoseNodes: function () {

      var bindMatrices = {};

      if ('Pose' in fbxTree.Objects) {

        var BindPoseNode = fbxTree.Objects.Pose;

        for (var nodeID in BindPoseNode) {

          if (BindPoseNode[nodeID].attrType === 'BindPose') {

            var poseNodes = BindPoseNode[nodeID].PoseNode;

            if (Array.isArray(poseNodes)) {

              poseNodes.forEach(function (poseNode) {

                bindMatrices[poseNode.Node] = new Matrix4().fromArray(poseNode.Matrix.a);

              });

            } else {

              bindMatrices[poseNodes.Node] = new Matrix4().fromArray(poseNodes.Matrix.a);

            }

          }

        }

      }

      return bindMatrices;

    },

    // Parse ambient color in FBXTree.GlobalSettings - if it's not set to black (default), create an ambient light
    createAmbientLight: function () {

      if ('GlobalSettings' in fbxTree && 'AmbientColor' in fbxTree.GlobalSettings) {

        var ambientColor = fbxTree.GlobalSettings.AmbientColor.value;
        var r = ambientColor[0];
        var g = ambientColor[1];
        var b = ambientColor[2];

        if (r !== 0 || g !== 0 || b !== 0) {

          var color = new Color(r, g, b);
          sceneGraph.add(new AmbientLight(color, 1));

        }

      }

    },

    setupMorphMaterials: function () {

      var scope = this;
      sceneGraph.traverse(function (child) {

        if (child.isMesh) {

          if (child.geometry.morphAttributes.position && child.geometry.morphAttributes.position.length) {

            if (Array.isArray(child.material)) {

              child.material.forEach(function (material, i) {

                scope.setupMorphMaterial(child, material, i);

              });

            } else {

              scope.setupMorphMaterial(child, child.material);

            }

          }

        }

      });

    },

    setupMorphMaterial: function (child, material, index) {

      var uuid = child.uuid;
      var matUuid = material.uuid;

      // if a geometry has morph targets, it cannot share the material with other geometries
      var sharedMat = false;

      sceneGraph.traverse(function (node) {

        if (node.isMesh) {

          if (Array.isArray(node.material)) {

            node.material.forEach(function (mat) {

              if (mat.uuid === matUuid && node.uuid !== uuid) sharedMat = true;

            });

          } else if (node.material.uuid === matUuid && node.uuid !== uuid) sharedMat = true;

        }

      });

      if (sharedMat === true) {

        var clonedMat = material.clone();
        clonedMat.morphTargets = true;

        if (index === undefined) child.material = clonedMat;
        else child.material[index] = clonedMat;

      } else material.morphTargets = true;

    }

  };

  // parse Geometry data from FBXTree and return map of BufferGeometries
  function GeometryParser() {
  }

  GeometryParser.prototype = {

    constructor: GeometryParser,

    // Parse nodes in FBXTree.Objects.Geometry
    parse: function (deformers) {

      var geometryMap = new Map();

      if ('Geometry' in fbxTree.Objects) {

        var geoNodes = fbxTree.Objects.Geometry;

        for (var nodeID in geoNodes) {

          var relationships = connections.get(parseInt(nodeID));
          var geo = this.parseGeometry(relationships, geoNodes[nodeID], deformers);

          geometryMap.set(parseInt(nodeID), geo);

        }

      }

      return geometryMap;

    },

    // Parse single node in FBXTree.Objects.Geometry
    parseGeometry: function (relationships, geoNode, deformers) {

      switch (geoNode.attrType) {

        case 'Mesh':
          return this.parseMeshGeometry(relationships, geoNode, deformers);
          break;

        case 'NurbsCurve':
          return this.parseNurbsGeometry(geoNode);
          break;

      }

    },


    // Parse single node mesh geometry in FBXTree.Objects.Geometry
    parseMeshGeometry: function (relationships, geoNode, deformers) {

      var skeletons = deformers.skeletons;
      var morphTargets = [];

      var modelNodes = relationships.parents.map(function (parent) {

        return fbxTree.Objects.Model[parent.ID];

      });

      // don't create geometry if it is not associated with any models
      if (modelNodes.length === 0) return;

      var skeleton = relationships.children.reduce(function (skeleton, child) {

        if (skeletons[child.ID] !== undefined) skeleton = skeletons[child.ID];

        return skeleton;

      }, null);

      relationships.children.forEach(function (child) {

        if (deformers.morphTargets[child.ID] !== undefined) {

          morphTargets.push(deformers.morphTargets[child.ID]);

        }

      });

      // Assume one model and get the preRotation from that
      // if there is more than one model associated with the geometry this may cause problems
      var modelNode = modelNodes[0];

      var transformData = {};

      if ('RotationOrder' in modelNode) transformData.eulerOrder = getEulerOrder(modelNode.RotationOrder.value);
      if ('InheritType' in modelNode) transformData.inheritType = parseInt(modelNode.InheritType.value);

      if ('GeometricTranslation' in modelNode) transformData.translation = modelNode.GeometricTranslation.value;
      if ('GeometricRotation' in modelNode) transformData.rotation = modelNode.GeometricRotation.value;
      if ('GeometricScaling' in modelNode) transformData.scale = modelNode.GeometricScaling.value;

      var transform = generateTransform(transformData);

      return this.genGeometry(geoNode, skeleton, morphTargets, transform);

    },

    // Generate a BufferGeometry from a node in FBXTree.Objects.Geometry
    genGeometry: function (geoNode, skeleton, morphTargets, preTransform) {

      var geo = new BufferGeometry();
      if (geoNode.attrName) geo.name = geoNode.attrName;

      var geoInfo = this.parseGeoNode(geoNode, skeleton);
      var buffers = this.genBuffers(geoInfo);

      var positionAttribute = new Float32BufferAttribute(buffers.vertex, 3);

      positionAttribute.applyMatrix4(preTransform);

      geo.setAttribute('position', positionAttribute);

      if (buffers.colors.length > 0) {

        geo.setAttribute('color', new Float32BufferAttribute(buffers.colors, 3));

      }

      if (skeleton) {

        geo.setAttribute('skinIndex', new Uint16BufferAttribute(buffers.weightsIndices, 4));

        geo.setAttribute('skinWeight', new Float32BufferAttribute(buffers.vertexWeights, 4));

        // used later to bind the skeleton to the model
        geo.FBX_Deformer = skeleton;

      }

      if (buffers.normal.length > 0) {

        var normalMatrix = new Matrix3().getNormalMatrix(preTransform);

        var normalAttribute = new Float32BufferAttribute(buffers.normal, 3);
        normalAttribute.applyNormalMatrix(normalMatrix);

        geo.setAttribute('normal', normalAttribute);

      }

      buffers.uvs.forEach(function (uvBuffer, i) {

        // subsequent uv buffers are called 'uv1', 'uv2', ...
        var name = 'uv' + (i + 1).toString();

        // the first uv buffer is just called 'uv'
        if (i === 0) {

          name = 'uv';

        }

        geo.setAttribute(name, new Float32BufferAttribute(buffers.uvs[i], 2));

      });

      if (geoInfo.material && geoInfo.material.mappingType !== 'AllSame') {

        // Convert the material indices of each vertex into rendering groups on the geometry.
        var prevMaterialIndex = buffers.materialIndex[0];
        var startIndex = 0;

        buffers.materialIndex.forEach(function (currentIndex, i) {

          if (currentIndex !== prevMaterialIndex) {

            geo.addGroup(startIndex, i - startIndex, prevMaterialIndex);

            prevMaterialIndex = currentIndex;
            startIndex = i;

          }

        });

        // the loop above doesn't add the last group, do that here.
        if (geo.groups.length > 0) {

          var lastGroup = geo.groups[geo.groups.length - 1];
          var lastIndex = lastGroup.start + lastGroup.count;

          if (lastIndex !== buffers.materialIndex.length) {

            geo.addGroup(lastIndex, buffers.materialIndex.length - lastIndex, prevMaterialIndex);

          }

        }

        // case where there are multiple materials but the whole geometry is only
        // using one of them
        if (geo.groups.length === 0) {

          geo.addGroup(0, buffers.materialIndex.length, buffers.materialIndex[0]);

        }

      }

      this.addMorphTargets(geo, geoNode, morphTargets, preTransform);

      return geo;

    },

    parseGeoNode: function (geoNode, skeleton) {

      var geoInfo = {};

      geoInfo.vertexPositions = (geoNode.Vertices !== undefined) ? geoNode.Vertices.a : [];
      geoInfo.vertexIndices = (geoNode.PolygonVertexIndex !== undefined) ? geoNode.PolygonVertexIndex.a : [];

      if (geoNode.LayerElementColor) {

        geoInfo.color = this.parseVertexColors(geoNode.LayerElementColor[0]);

      }

      if (geoNode.LayerElementMaterial) {

        geoInfo.material = this.parseMaterialIndices(geoNode.LayerElementMaterial[0]);

      }

      if (geoNode.LayerElementNormal) {

        geoInfo.normal = this.parseNormals(geoNode.LayerElementNormal[0]);

      }

      if (geoNode.LayerElementUV) {

        geoInfo.uv = [];

        var i = 0;
        while (geoNode.LayerElementUV[i]) {

          if (geoNode.LayerElementUV[i].UV) {

            geoInfo.uv.push(this.parseUVs(geoNode.LayerElementUV[i]));

          }

          i++;

        }

      }

      geoInfo.weightTable = {};

      if (skeleton !== null) {

        geoInfo.skeleton = skeleton;

        skeleton.rawBones.forEach(function (rawBone, i) {

          // loop over the bone's vertex indices and weights
          rawBone.indices.forEach(function (index, j) {

            if (geoInfo.weightTable[index] === undefined) geoInfo.weightTable[index] = [];

            geoInfo.weightTable[index].push({

              id: i,
              weight: rawBone.weights[j],

            });

          });

        });

      }

      return geoInfo;

    },

    genBuffers: function (geoInfo) {

      var buffers = {
        vertex: [],
        normal: [],
        colors: [],
        uvs: [],
        materialIndex: [],
        vertexWeights: [],
        weightsIndices: [],
      };

      var polygonIndex = 0;
      var faceLength = 0;
      var displayedWeightsWarning = false;

      // these will hold data for a single face
      var facePositionIndexes = [];
      var faceNormals = [];
      var faceColors = [];
      var faceUVs = [];
      var faceWeights = [];
      var faceWeightIndices = [];

      var scope = this;
      geoInfo.vertexIndices.forEach(function (vertexIndex, polygonVertexIndex) {

        var endOfFace = false;

        // Face index and vertex index arrays are combined in a single array
        // A cube with quad faces looks like this:
        // PolygonVertexIndex: *24 {
        //  a: 0, 1, 3, -3, 2, 3, 5, -5, 4, 5, 7, -7, 6, 7, 1, -1, 1, 7, 5, -4, 6, 0, 2, -5
        //  }
        // Negative numbers mark the end of a face - first face here is 0, 1, 3, -3
        // to find index of last vertex bit shift the index: ^ - 1
        if (vertexIndex < 0) {

          vertexIndex = vertexIndex ^ -1; // equivalent to ( x * -1 ) - 1
          endOfFace = true;

        }

        var weightIndices = [];
        var weights = [];

        facePositionIndexes.push(vertexIndex * 3, vertexIndex * 3 + 1, vertexIndex * 3 + 2);

        if (geoInfo.color) {

          var data = getData(polygonVertexIndex, polygonIndex, vertexIndex, geoInfo.color);

          faceColors.push(data[0], data[1], data[2]);

        }

        if (geoInfo.skeleton) {

          if (geoInfo.weightTable[vertexIndex] !== undefined) {

            geoInfo.weightTable[vertexIndex].forEach(function (wt) {

              weights.push(wt.weight);
              weightIndices.push(wt.id);

            });


          }

          if (weights.length > 4) {

            if (!displayedWeightsWarning) {

              console.warn('THREE.FBXLoader: Vertex has more than 4 skinning weights assigned to vertex. Deleting additional weights.');
              displayedWeightsWarning = true;

            }

            var wIndex = [0, 0, 0, 0];
            var Weight = [0, 0, 0, 0];

            weights.forEach(function (weight, weightIndex) {

              var currentWeight = weight;
              var currentIndex = weightIndices[weightIndex];

              Weight.forEach(function (comparedWeight, comparedWeightIndex, comparedWeightArray) {

                if (currentWeight > comparedWeight) {

                  comparedWeightArray[comparedWeightIndex] = currentWeight;
                  currentWeight = comparedWeight;

                  var tmp = wIndex[comparedWeightIndex];
                  wIndex[comparedWeightIndex] = currentIndex;
                  currentIndex = tmp;

                }

              });

            });

            weightIndices = wIndex;
            weights = Weight;

          }

          // if the weight array is shorter than 4 pad with 0s
          while (weights.length < 4) {

            weights.push(0);
            weightIndices.push(0);

          }

          for (var i = 0; i < 4; ++i) {

            faceWeights.push(weights[i]);
            faceWeightIndices.push(weightIndices[i]);

          }

        }

        if (geoInfo.normal) {

          var data = getData(polygonVertexIndex, polygonIndex, vertexIndex, geoInfo.normal);

          faceNormals.push(data[0], data[1], data[2]);

        }

        if (geoInfo.material && geoInfo.material.mappingType !== 'AllSame') {

          var materialIndex = getData(polygonVertexIndex, polygonIndex, vertexIndex, geoInfo.material)[0];

        }

        if (geoInfo.uv) {

          geoInfo.uv.forEach(function (uv, i) {

            var data = getData(polygonVertexIndex, polygonIndex, vertexIndex, uv);

            if (faceUVs[i] === undefined) {

              faceUVs[i] = [];

            }

            faceUVs[i].push(data[0]);
            faceUVs[i].push(data[1]);

          });

        }

        faceLength++;

        if (endOfFace) {

          scope.genFace(buffers, geoInfo, facePositionIndexes, materialIndex, faceNormals, faceColors, faceUVs, faceWeights, faceWeightIndices, faceLength);

          polygonIndex++;
          faceLength = 0;

          // reset arrays for the next face
          facePositionIndexes = [];
          faceNormals = [];
          faceColors = [];
          faceUVs = [];
          faceWeights = [];
          faceWeightIndices = [];

        }

      });

      return buffers;

    },

    // Generate data for a single face in a geometry. If the face is a quad then split it into 2 tris
    genFace: function (buffers, geoInfo, facePositionIndexes, materialIndex, faceNormals, faceColors, faceUVs, faceWeights, faceWeightIndices, faceLength) {

      for (var i = 2; i < faceLength; i++) {

        buffers.vertex.push(geoInfo.vertexPositions[facePositionIndexes[0]]);
        buffers.vertex.push(geoInfo.vertexPositions[facePositionIndexes[1]]);
        buffers.vertex.push(geoInfo.vertexPositions[facePositionIndexes[2]]);

        buffers.vertex.push(geoInfo.vertexPositions[facePositionIndexes[(i - 1) * 3]]);
        buffers.vertex.push(geoInfo.vertexPositions[facePositionIndexes[(i - 1) * 3 + 1]]);
        buffers.vertex.push(geoInfo.vertexPositions[facePositionIndexes[(i - 1) * 3 + 2]]);

        buffers.vertex.push(geoInfo.vertexPositions[facePositionIndexes[i * 3]]);
        buffers.vertex.push(geoInfo.vertexPositions[facePositionIndexes[i * 3 + 1]]);
        buffers.vertex.push(geoInfo.vertexPositions[facePositionIndexes[i * 3 + 2]]);

        if (geoInfo.skeleton) {

          buffers.vertexWeights.push(faceWeights[0]);
          buffers.vertexWeights.push(faceWeights[1]);
          buffers.vertexWeights.push(faceWeights[2]);
          buffers.vertexWeights.push(faceWeights[3]);

          buffers.vertexWeights.push(faceWeights[(i - 1) * 4]);
          buffers.vertexWeights.push(faceWeights[(i - 1) * 4 + 1]);
          buffers.vertexWeights.push(faceWeights[(i - 1) * 4 + 2]);
          buffers.vertexWeights.push(faceWeights[(i - 1) * 4 + 3]);

          buffers.vertexWeights.push(faceWeights[i * 4]);
          buffers.vertexWeights.push(faceWeights[i * 4 + 1]);
          buffers.vertexWeights.push(faceWeights[i * 4 + 2]);
          buffers.vertexWeights.push(faceWeights[i * 4 + 3]);

          buffers.weightsIndices.push(faceWeightIndices[0]);
          buffers.weightsIndices.push(faceWeightIndices[1]);
          buffers.weightsIndices.push(faceWeightIndices[2]);
          buffers.weightsIndices.push(faceWeightIndices[3]);

          buffers.weightsIndices.push(faceWeightIndices[(i - 1) * 4]);
          buffers.weightsIndices.push(faceWeightIndices[(i - 1) * 4 + 1]);
          buffers.weightsIndices.push(faceWeightIndices[(i - 1) * 4 + 2]);
          buffers.weightsIndices.push(faceWeightIndices[(i - 1) * 4 + 3]);

          buffers.weightsIndices.push(faceWeightIndices[i * 4]);
          buffers.weightsIndices.push(faceWeightIndices[i * 4 + 1]);
          buffers.weightsIndices.push(faceWeightIndices[i * 4 + 2]);
          buffers.weightsIndices.push(faceWeightIndices[i * 4 + 3]);

        }

        if (geoInfo.color) {

          buffers.colors.push(faceColors[0]);
          buffers.colors.push(faceColors[1]);
          buffers.colors.push(faceColors[2]);

          buffers.colors.push(faceColors[(i - 1) * 3]);
          buffers.colors.push(faceColors[(i - 1) * 3 + 1]);
          buffers.colors.push(faceColors[(i - 1) * 3 + 2]);

          buffers.colors.push(faceColors[i * 3]);
          buffers.colors.push(faceColors[i * 3 + 1]);
          buffers.colors.push(faceColors[i * 3 + 2]);

        }

        if (geoInfo.material && geoInfo.material.mappingType !== 'AllSame') {

          buffers.materialIndex.push(materialIndex);
          buffers.materialIndex.push(materialIndex);
          buffers.materialIndex.push(materialIndex);

        }

        if (geoInfo.normal) {

          buffers.normal.push(faceNormals[0]);
          buffers.normal.push(faceNormals[1]);
          buffers.normal.push(faceNormals[2]);

          buffers.normal.push(faceNormals[(i - 1) * 3]);
          buffers.normal.push(faceNormals[(i - 1) * 3 + 1]);
          buffers.normal.push(faceNormals[(i - 1) * 3 + 2]);

          buffers.normal.push(faceNormals[i * 3]);
          buffers.normal.push(faceNormals[i * 3 + 1]);
          buffers.normal.push(faceNormals[i * 3 + 2]);

        }

        if (geoInfo.uv) {

          geoInfo.uv.forEach(function (uv, j) {

            if (buffers.uvs[j] === undefined) buffers.uvs[j] = [];

            buffers.uvs[j].push(faceUVs[j][0]);
            buffers.uvs[j].push(faceUVs[j][1]);

            buffers.uvs[j].push(faceUVs[j][(i - 1) * 2]);
            buffers.uvs[j].push(faceUVs[j][(i - 1) * 2 + 1]);

            buffers.uvs[j].push(faceUVs[j][i * 2]);
            buffers.uvs[j].push(faceUVs[j][i * 2 + 1]);

          });

        }

      }

    },

    addMorphTargets: function (parentGeo, parentGeoNode, morphTargets, preTransform) {

      if (morphTargets.length === 0) return;

      parentGeo.morphTargetsRelative = true;

      parentGeo.morphAttributes.position = [];
      // parentGeo.morphAttributes.normal = []; // not implemented

      var scope = this;
      morphTargets.forEach(function (morphTarget) {

        morphTarget.rawTargets.forEach(function (rawTarget) {

          var morphGeoNode = fbxTree.Objects.Geometry[rawTarget.geoID];

          if (morphGeoNode !== undefined) {

            scope.genMorphGeometry(parentGeo, parentGeoNode, morphGeoNode, preTransform, rawTarget.name);

          }

        });

      });

    },

    // a morph geometry node is similar to a standard  node, and the node is also contained
    // in FBXTree.Objects.Geometry, however it can only have attributes for position, normal
    // and a special attribute Index defining which vertices of the original geometry are affected
    // Normal and position attributes only have data for the vertices that are affected by the morph
    genMorphGeometry: function (parentGeo, parentGeoNode, morphGeoNode, preTransform, name) {

      var vertexIndices = (parentGeoNode.PolygonVertexIndex !== undefined) ? parentGeoNode.PolygonVertexIndex.a : [];

      var morphPositionsSparse = (morphGeoNode.Vertices !== undefined) ? morphGeoNode.Vertices.a : [];
      var indices = (morphGeoNode.Indexes !== undefined) ? morphGeoNode.Indexes.a : [];

      var length = parentGeo.attributes.position.count * 3;
      var morphPositions = new Float32Array(length);

      for (var i = 0; i < indices.length; i++) {

        var morphIndex = indices[i] * 3;

        morphPositions[morphIndex] = morphPositionsSparse[i * 3];
        morphPositions[morphIndex + 1] = morphPositionsSparse[i * 3 + 1];
        morphPositions[morphIndex + 2] = morphPositionsSparse[i * 3 + 2];

      }

      // TODO: add morph normal support
      var morphGeoInfo = {
        vertexIndices: vertexIndices,
        vertexPositions: morphPositions,

      };

      var morphBuffers = this.genBuffers(morphGeoInfo);

      var positionAttribute = new Float32BufferAttribute(morphBuffers.vertex, 3);
      positionAttribute.name = name || morphGeoNode.attrName;

      positionAttribute.applyMatrix4(preTransform);

      parentGeo.morphAttributes.position.push(positionAttribute);

    },

    // Parse normal from FBXTree.Objects.Geometry.LayerElementNormal if it exists
    parseNormals: function (NormalNode) {

      var mappingType = NormalNode.MappingInformationType;
      var referenceType = NormalNode.ReferenceInformationType;
      var buffer = NormalNode.Normals.a;
      var indexBuffer = [];
      if (referenceType === 'IndexToDirect') {

        if ('NormalIndex' in NormalNode) {

          indexBuffer = NormalNode.NormalIndex.a;

        } else if ('NormalsIndex' in NormalNode) {

          indexBuffer = NormalNode.NormalsIndex.a;

        }

      }

      return {
        dataSize: 3,
        buffer: buffer,
        indices: indexBuffer,
        mappingType: mappingType,
        referenceType: referenceType
      };

    },

    // Parse UVs from FBXTree.Objects.Geometry.LayerElementUV if it exists
    parseUVs: function (UVNode) {

      var mappingType = UVNode.MappingInformationType;
      var referenceType = UVNode.ReferenceInformationType;
      var buffer = UVNode.UV.a;
      var indexBuffer = [];
      if (referenceType === 'IndexToDirect') {

        indexBuffer = UVNode.UVIndex.a;

      }

      return {
        dataSize: 2,
        buffer: buffer,
        indices: indexBuffer,
        mappingType: mappingType,
        referenceType: referenceType
      };

    },

    // Parse Vertex Colors from FBXTree.Objects.Geometry.LayerElementColor if it exists
    parseVertexColors: function (ColorNode) {

      var mappingType = ColorNode.MappingInformationType;
      var referenceType = ColorNode.ReferenceInformationType;
      var buffer = ColorNode.Colors.a;
      var indexBuffer = [];
      if (referenceType === 'IndexToDirect') {

        indexBuffer = ColorNode.ColorIndex.a;

      }

      return {
        dataSize: 4,
        buffer: buffer,
        indices: indexBuffer,
        mappingType: mappingType,
        referenceType: referenceType
      };

    },

    // Parse mapping and material data in FBXTree.Objects.Geometry.LayerElementMaterial if it exists
    parseMaterialIndices: function (MaterialNode) {

      var mappingType = MaterialNode.MappingInformationType;
      var referenceType = MaterialNode.ReferenceInformationType;

      if (mappingType === 'NoMappingInformation') {

        return {
          dataSize: 1,
          buffer: [0],
          indices: [0],
          mappingType: 'AllSame',
          referenceType: referenceType
        };

      }

      var materialIndexBuffer = MaterialNode.Materials.a;

      // Since materials are stored as indices, there's a bit of a mismatch between FBX and what
      // we expect.So we create an intermediate buffer that points to the index in the buffer,
      // for conforming with the other functions we've written for other data.
      var materialIndices = [];

      for (var i = 0; i < materialIndexBuffer.length; ++i) {

        materialIndices.push(i);

      }

      return {
        dataSize: 1,
        buffer: materialIndexBuffer,
        indices: materialIndices,
        mappingType: mappingType,
        referenceType: referenceType
      };

    },

    // Generate a NurbGeometry from a node in FBXTree.Objects.Geometry
    parseNurbsGeometry: function (geoNode) {

      if (NURBSCurve === undefined) {

        console.error('THREE.FBXLoader: The loader relies on NURBSCurve for any nurbs present in the model. Nurbs will show up as empty geometry.');
        return new BufferGeometry();

      }

      var order = parseInt(geoNode.Order);

      if (isNaN(order)) {

        console.error('THREE.FBXLoader: Invalid Order %s given for geometry ID: %s', geoNode.Order, geoNode.id);
        return new BufferGeometry();

      }

      var degree = order - 1;

      var knots = geoNode.KnotVector.a;
      var controlPoints = [];
      var pointsValues = geoNode.Points.a;

      for (var i = 0, l = pointsValues.length; i < l; i += 4) {

        controlPoints.push(new Vector4().fromArray(pointsValues, i));

      }

      var startKnot, endKnot;

      if (geoNode.Form === 'Closed') {

        controlPoints.push(controlPoints[0]);

      } else if (geoNode.Form === 'Periodic') {

        startKnot = degree;
        endKnot = knots.length - 1 - startKnot;

        for (var i = 0; i < degree; ++i) {

          controlPoints.push(controlPoints[i]);

        }

      }

      var curve = new NURBSCurve(degree, knots, controlPoints, startKnot, endKnot);
      var vertices = curve.getPoints(controlPoints.length * 7);

      var positions = new Float32Array(vertices.length * 3);

      vertices.forEach(function (vertex, i) {

        vertex.toArray(positions, i * 3);

      });

      var geometry = new BufferGeometry();
      geometry.setAttribute('position', new BufferAttribute(positions, 3));

      return geometry;

    },

  };

  // parse animation data from FBXTree
  function AnimationParser() {
  }

  AnimationParser.prototype = {

    constructor: AnimationParser,

    // take raw animation clips and turn them into three.js animation clips
    parse: function () {

      var animationClips = [];

      var rawClips = this.parseClips();

      if (rawClips !== undefined) {

        for (var key in rawClips) {

          var rawClip = rawClips[key];

          var clip = this.addClip(rawClip);

          animationClips.push(clip);

        }

      }

      return animationClips;

    },

    parseClips: function () {

      // since the actual transformation data is stored in FBXTree.Objects.AnimationCurve,
      // if this is undefined we can safely assume there are no animations
      if (fbxTree.Objects.AnimationCurve === undefined) return undefined;

      var curveNodesMap = this.parseAnimationCurveNodes();

      this.parseAnimationCurves(curveNodesMap);

      var layersMap = this.parseAnimationLayers(curveNodesMap);
      var rawClips = this.parseAnimStacks(layersMap);

      return rawClips;

    },

    // parse nodes in FBXTree.Objects.AnimationCurveNode
    // each AnimationCurveNode holds data for an animation transform for a model (e.g. left arm rotation )
    // and is referenced by an AnimationLayer
    parseAnimationCurveNodes: function () {

      var rawCurveNodes = fbxTree.Objects.AnimationCurveNode;

      var curveNodesMap = new Map();

      for (var nodeID in rawCurveNodes) {

        var rawCurveNode = rawCurveNodes[nodeID];

        if (rawCurveNode.attrName.match(/S|R|T|DeformPercent/) !== null) {

          var curveNode = {

            id: rawCurveNode.id,
            attr: rawCurveNode.attrName,
            curves: {},

          };

          curveNodesMap.set(curveNode.id, curveNode);

        }

      }

      return curveNodesMap;

    },

    // parse nodes in FBXTree.Objects.AnimationCurve and connect them up to
    // previously parsed AnimationCurveNodes. Each AnimationCurve holds data for a single animated
    // axis ( e.g. times and values of x rotation)
    parseAnimationCurves: function (curveNodesMap) {

      var rawCurves = fbxTree.Objects.AnimationCurve;

      // TODO: Many values are identical up to roundoff error, but won't be optimised
      // e.g. position times: [0, 0.4, 0. 8]
      // position values: [7.23538335023477e-7, 93.67518615722656, -0.9982695579528809, 7.23538335023477e-7, 93.67518615722656, -0.9982695579528809, 7.235384487103147e-7, 93.67520904541016, -0.9982695579528809]
      // clearly, this should be optimised to
      // times: [0], positions [7.23538335023477e-7, 93.67518615722656, -0.9982695579528809]
      // this shows up in nearly every FBX file, and generally time array is length > 100

      for (var nodeID in rawCurves) {

        var animationCurve = {

          id: rawCurves[nodeID].id,
          times: rawCurves[nodeID].KeyTime.a.map(convertFBXTimeToSeconds),
          values: rawCurves[nodeID].KeyValueFloat.a,

        };

        var relationships = connections.get(animationCurve.id);

        if (relationships !== undefined) {

          var animationCurveID = relationships.parents[0].ID;
          var animationCurveRelationship = relationships.parents[0].relationship;

          if (animationCurveRelationship.match(/X/)) {

            curveNodesMap.get(animationCurveID).curves['x'] = animationCurve;

          } else if (animationCurveRelationship.match(/Y/)) {

            curveNodesMap.get(animationCurveID).curves['y'] = animationCurve;

          } else if (animationCurveRelationship.match(/Z/)) {

            curveNodesMap.get(animationCurveID).curves['z'] = animationCurve;

          } else if (animationCurveRelationship.match(/d|DeformPercent/) && curveNodesMap.has(animationCurveID)) {

            curveNodesMap.get(animationCurveID).curves['morph'] = animationCurve;

          }

        }

      }

    },

    // parse nodes in FBXTree.Objects.AnimationLayer. Each layers holds references
    // to various AnimationCurveNodes and is referenced by an AnimationStack node
    // note: theoretically a stack can have multiple layers, however in practice there always seems to be one per stack
    parseAnimationLayers: function (curveNodesMap) {

      var rawLayers = fbxTree.Objects.AnimationLayer;

      var layersMap = new Map();

      for (var nodeID in rawLayers) {

        var layerCurveNodes = [];

        var connection = connections.get(parseInt(nodeID));

        if (connection !== undefined) {

          // all the animationCurveNodes used in the layer
          var children = connection.children;

          children.forEach(function (child, i) {

            if (curveNodesMap.has(child.ID)) {

              var curveNode = curveNodesMap.get(child.ID);

              // check that the curves are defined for at least one axis, otherwise ignore the curveNode
              if (curveNode.curves.x !== undefined || curveNode.curves.y !== undefined || curveNode.curves.z !== undefined) {

                if (layerCurveNodes[i] === undefined) {

                  var modelID = connections.get(child.ID).parents.filter(function (parent) {

                    return parent.relationship !== undefined;

                  })[0].ID;

                  if (modelID !== undefined) {

                    var rawModel = fbxTree.Objects.Model[modelID.toString()];

                    if (rawModel === undefined) {

                      console.warn('THREE.FBXLoader: Encountered a unused curve.', child);
                      return;

                    }

                    var node = {

                      modelName: rawModel.attrName ? PropertyBinding.sanitizeNodeName(rawModel.attrName) : '',
                      ID: rawModel.id,
                      initialPosition: [0, 0, 0],
                      initialRotation: [0, 0, 0],
                      initialScale: [1, 1, 1],

                    };

                    sceneGraph.traverse(function (child) {

                      if (child.ID === rawModel.id) {

                        node.transform = child.matrix;

                        if (child.userData.transformData) node.eulerOrder = child.userData.transformData.eulerOrder;

                      }

                    });

                    if (!node.transform) node.transform = new Matrix4();

                    // if the animated model is pre rotated, we'll have to apply the pre rotations to every
                    // animation value as well
                    if ('PreRotation' in rawModel) node.preRotation = rawModel.PreRotation.value;
                    if ('PostRotation' in rawModel) node.postRotation = rawModel.PostRotation.value;

                    layerCurveNodes[i] = node;

                  }

                }

                if (layerCurveNodes[i]) layerCurveNodes[i][curveNode.attr] = curveNode;

              } else if (curveNode.curves.morph !== undefined) {

                if (layerCurveNodes[i] === undefined) {

                  var deformerID = connections.get(child.ID).parents.filter(function (parent) {

                    return parent.relationship !== undefined;

                  })[0].ID;

                  var morpherID = connections.get(deformerID).parents[0].ID;
                  var geoID = connections.get(morpherID).parents[0].ID;

                  // assuming geometry is not used in more than one model
                  var modelID = connections.get(geoID).parents[0].ID;

                  var rawModel = fbxTree.Objects.Model[modelID];

                  var node = {

                    modelName: rawModel.attrName ? PropertyBinding.sanitizeNodeName(rawModel.attrName) : '',
                    morphName: fbxTree.Objects.Deformer[deformerID].attrName,

                  };

                  layerCurveNodes[i] = node;

                }

                layerCurveNodes[i][curveNode.attr] = curveNode;

              }

            }

          });

          layersMap.set(parseInt(nodeID), layerCurveNodes);

        }

      }

      return layersMap;

    },

    // parse nodes in FBXTree.Objects.AnimationStack. These are the top level node in the animation
    // hierarchy. Each Stack node will be used to create a AnimationClip
    parseAnimStacks: function (layersMap) {

      var rawStacks = fbxTree.Objects.AnimationStack;

      // connect the stacks (clips) up to the layers
      var rawClips = {};

      for (var nodeID in rawStacks) {

        var children = connections.get(parseInt(nodeID)).children;

        if (children.length > 1) {

          // it seems like stacks will always be associated with a single layer. But just in case there are files
          // where there are multiple layers per stack, we'll display a warning
          console.warn('THREE.FBXLoader: Encountered an animation stack with multiple layers, this is currently not supported. Ignoring subsequent layers.');

        }

        var layer = layersMap.get(children[0].ID);

        rawClips[nodeID] = {

          name: rawStacks[nodeID].attrName,
          layer: layer,

        };

      }

      return rawClips;

    },

    addClip: function (rawClip) {

      var tracks = [];

      var scope = this;
      rawClip.layer.forEach(function (rawTracks) {

        tracks = tracks.concat(scope.generateTracks(rawTracks));

      });

      return new AnimationClip(rawClip.name, -1, tracks);

    },

    generateTracks: function (rawTracks) {

      var tracks = [];

      var initialPosition = new Vector3();
      var initialRotation = new Quaternion();
      var initialScale = new Vector3();

      if (rawTracks.transform) rawTracks.transform.decompose(initialPosition, initialRotation, initialScale);

      initialPosition = initialPosition.toArray();
      initialRotation = new Euler().setFromQuaternion(initialRotation, rawTracks.eulerOrder).toArray();
      initialScale = initialScale.toArray();

      if (rawTracks.T !== undefined && Object.keys(rawTracks.T.curves).length > 0) {

        var positionTrack = this.generateVectorTrack(rawTracks.modelName, rawTracks.T.curves, initialPosition, 'position');
        if (positionTrack !== undefined) tracks.push(positionTrack);

      }

      if (rawTracks.R !== undefined && Object.keys(rawTracks.R.curves).length > 0) {

        var rotationTrack = this.generateRotationTrack(rawTracks.modelName, rawTracks.R.curves, initialRotation, rawTracks.preRotation, rawTracks.postRotation, rawTracks.eulerOrder);
        if (rotationTrack !== undefined) tracks.push(rotationTrack);

      }

      if (rawTracks.S !== undefined && Object.keys(rawTracks.S.curves).length > 0) {

        var scaleTrack = this.generateVectorTrack(rawTracks.modelName, rawTracks.S.curves, initialScale, 'scale');
        if (scaleTrack !== undefined) tracks.push(scaleTrack);

      }

      if (rawTracks.DeformPercent !== undefined) {

        var morphTrack = this.generateMorphTrack(rawTracks);
        if (morphTrack !== undefined) tracks.push(morphTrack);

      }

      return tracks;

    },

    generateVectorTrack: function (modelName, curves, initialValue, type) {

      var times = this.getTimesForAllAxes(curves);
      var values = this.getKeyframeTrackValues(times, curves, initialValue);

      return new VectorKeyframeTrack(modelName + '.' + type, times, values);

    },

    generateRotationTrack: function (modelName, curves, initialValue, preRotation, postRotation, eulerOrder) {

      if (curves.x !== undefined) {

        this.interpolateRotations(curves.x);
        curves.x.values = curves.x.values.map(MathUtils.degToRad);

      }

      if (curves.y !== undefined) {

        this.interpolateRotations(curves.y);
        curves.y.values = curves.y.values.map(MathUtils.degToRad);

      }

      if (curves.z !== undefined) {

        this.interpolateRotations(curves.z);
        curves.z.values = curves.z.values.map(MathUtils.degToRad);

      }

      var times = this.getTimesForAllAxes(curves);
      var values = this.getKeyframeTrackValues(times, curves, initialValue);

      if (preRotation !== undefined) {

        preRotation = preRotation.map(MathUtils.degToRad);
        preRotation.push(eulerOrder);

        preRotation = new Euler().fromArray(preRotation);
        preRotation = new Quaternion().setFromEuler(preRotation);

      }

      if (postRotation !== undefined) {

        postRotation = postRotation.map(MathUtils.degToRad);
        postRotation.push(eulerOrder);

        postRotation = new Euler().fromArray(postRotation);
        postRotation = new Quaternion().setFromEuler(postRotation).inverse();

      }

      var quaternion = new Quaternion();
      var euler = new Euler();

      var quaternionValues = [];

      for (var i = 0; i < values.length; i += 3) {

        euler.set(values[i], values[i + 1], values[i + 2], eulerOrder);

        quaternion.setFromEuler(euler);

        if (preRotation !== undefined) quaternion.premultiply(preRotation);
        if (postRotation !== undefined) quaternion.multiply(postRotation);

        quaternion.toArray(quaternionValues, (i / 3) * 4);

      }

      return new QuaternionKeyframeTrack(modelName + '.quaternion', times, quaternionValues);

    },

    generateMorphTrack: function (rawTracks) {

      var curves = rawTracks.DeformPercent.curves.morph;
      var values = curves.values.map(function (val) {

        return val / 100;

      });

      var morphNum = sceneGraph.getObjectByName(rawTracks.modelName).morphTargetDictionary[rawTracks.morphName];

      return new NumberKeyframeTrack(rawTracks.modelName + '.morphTargetInfluences[' + morphNum + ']', curves.times, values);

    },

    // For all animated objects, times are defined separately for each axis
    // Here we'll combine the times into one sorted array without duplicates
    getTimesForAllAxes: function (curves) {

      var times = [];

      // first join together the times for each axis, if defined
      if (curves.x !== undefined) times = times.concat(curves.x.times);
      if (curves.y !== undefined) times = times.concat(curves.y.times);
      if (curves.z !== undefined) times = times.concat(curves.z.times);

      // then sort them and remove duplicates
      times = times.sort(function (a, b) {

        return a - b;

      }).filter(function (elem, index, array) {

        return array.indexOf(elem) == index;

      });

      return times;

    },

    getKeyframeTrackValues: function (times, curves, initialValue) {

      var prevValue = initialValue;

      var values = [];

      var xIndex = -1;
      var yIndex = -1;
      var zIndex = -1;

      times.forEach(function (time) {

        if (curves.x) xIndex = curves.x.times.indexOf(time);
        if (curves.y) yIndex = curves.y.times.indexOf(time);
        if (curves.z) zIndex = curves.z.times.indexOf(time);

        // if there is an x value defined for this frame, use that
        if (xIndex !== -1) {

          var xValue = curves.x.values[xIndex];
          values.push(xValue);
          prevValue[0] = xValue;

        } else {

          // otherwise use the x value from the previous frame
          values.push(prevValue[0]);

        }

        if (yIndex !== -1) {

          var yValue = curves.y.values[yIndex];
          values.push(yValue);
          prevValue[1] = yValue;

        } else {

          values.push(prevValue[1]);

        }

        if (zIndex !== -1) {

          var zValue = curves.z.values[zIndex];
          values.push(zValue);
          prevValue[2] = zValue;

        } else {

          values.push(prevValue[2]);

        }

      });

      return values;

    },

    // Rotations are defined as Euler angles which can have values  of any size
    // These will be converted to quaternions which don't support values greater than
    // PI, so we'll interpolate large rotations
    interpolateRotations: function (curve) {

      for (var i = 1; i < curve.values.length; i++) {

        var initialValue = curve.values[i - 1];
        var valuesSpan = curve.values[i] - initialValue;

        var absoluteSpan = Math.abs(valuesSpan);

        if (absoluteSpan >= 180) {

          var numSubIntervals = absoluteSpan / 180;

          var step = valuesSpan / numSubIntervals;
          var nextValue = initialValue + step;

          var initialTime = curve.times[i - 1];
          var timeSpan = curve.times[i] - initialTime;
          var interval = timeSpan / numSubIntervals;
          var nextTime = initialTime + interval;

          var interpolatedTimes = [];
          var interpolatedValues = [];

          while (nextTime < curve.times[i]) {

            interpolatedTimes.push(nextTime);
            nextTime += interval;

            interpolatedValues.push(nextValue);
            nextValue += step;

          }

          curve.times = inject(curve.times, i, interpolatedTimes);
          curve.values = inject(curve.values, i, interpolatedValues);

        }

      }

    },

  };

  // parse an FBX file in ASCII format
  function TextParser() {
  }

  TextParser.prototype = {

    constructor: TextParser,

    getPrevNode: function () {

      return this.nodeStack[this.currentIndent - 2];

    },

    getCurrentNode: function () {

      return this.nodeStack[this.currentIndent - 1];

    },

    getCurrentProp: function () {

      return this.currentProp;

    },

    pushStack: function (node) {

      this.nodeStack.push(node);
      this.currentIndent += 1;

    },

    popStack: function () {

      this.nodeStack.pop();
      this.currentIndent -= 1;

    },

    setCurrentProp: function (val, name) {

      this.currentProp = val;
      this.currentPropName = name;

    },

    parse: function (text) {

      this.currentIndent = 0;

      this.allNodes = new FBXTree();
      this.nodeStack = [];
      this.currentProp = [];
      this.currentPropName = '';

      var scope = this;

      var split = text.split(/[\r\n]+/);

      split.forEach(function (line, i) {

        var matchComment = line.match(/^[\s\t]*;/);
        var matchEmpty = line.match(/^[\s\t]*$/);

        if (matchComment || matchEmpty) return;

        var matchBeginning = line.match('^\\t{' + scope.currentIndent + '}(\\w+):(.*){', '');
        var matchProperty = line.match('^\\t{' + (scope.currentIndent) + '}(\\w+):[\\s\\t\\r\\n](.*)');
        var matchEnd = line.match('^\\t{' + (scope.currentIndent - 1) + '}}');

        if (matchBeginning) {

          scope.parseNodeBegin(line, matchBeginning);

        } else if (matchProperty) {

          scope.parseNodeProperty(line, matchProperty, split[++i]);

        } else if (matchEnd) {

          scope.popStack();

        } else if (line.match(/^[^\s\t}]/)) {

          // large arrays are split over multiple lines terminated with a ',' character
          // if this is encountered the line needs to be joined to the previous line
          scope.parseNodePropertyContinued(line);

        }

      });

      return this.allNodes;

    },

    parseNodeBegin: function (line, property) {

      var nodeName = property[1].trim().replace(/^"/, '').replace(/"$/, '');

      var nodeAttrs = property[2].split(',').map(function (attr) {

        return attr.trim().replace(/^"/, '').replace(/"$/, '');

      });

      var node = {name: nodeName};
      var attrs = this.parseNodeAttr(nodeAttrs);

      var currentNode = this.getCurrentNode();

      // a top node
      if (this.currentIndent === 0) {

        this.allNodes.add(nodeName, node);

      } else { // a subnode

        // if the subnode already exists, append it
        if (nodeName in currentNode) {

          // special case Pose needs PoseNodes as an array
          if (nodeName === 'PoseNode') {

            currentNode.PoseNode.push(node);

          } else if (currentNode[nodeName].id !== undefined) {

            currentNode[nodeName] = {};
            currentNode[nodeName][currentNode[nodeName].id] = currentNode[nodeName];

          }

          if (attrs.id !== '') currentNode[nodeName][attrs.id] = node;

        } else if (typeof attrs.id === 'number') {

          currentNode[nodeName] = {};
          currentNode[nodeName][attrs.id] = node;

        } else if (nodeName !== 'Properties70') {

          if (nodeName === 'PoseNode') currentNode[nodeName] = [node];
          else currentNode[nodeName] = node;

        }

      }

      if (typeof attrs.id === 'number') node.id = attrs.id;
      if (attrs.name !== '') node.attrName = attrs.name;
      if (attrs.type !== '') node.attrType = attrs.type;

      this.pushStack(node);

    },

    parseNodeAttr: function (attrs) {

      var id = attrs[0];

      if (attrs[0] !== '') {

        id = parseInt(attrs[0]);

        if (isNaN(id)) {

          id = attrs[0];

        }

      }

      var name = '', type = '';

      if (attrs.length > 1) {

        name = attrs[1].replace(/^(\w+)::/, '');
        type = attrs[2];

      }

      return {id: id, name: name, type: type};

    },

    parseNodeProperty: function (line, property, contentLine) {

      var propName = property[1].replace(/^"/, '').replace(/"$/, '').trim();
      var propValue = property[2].replace(/^"/, '').replace(/"$/, '').trim();

      // for special case: base64 image data follows "Content: ," line
      //	Content: ,
      //	 "/9j/4RDaRXhpZgAATU0A..."
      if (propName === 'Content' && propValue === ',') {

        propValue = contentLine.replace(/"/g, '').replace(/,$/, '').trim();

      }

      var currentNode = this.getCurrentNode();
      var parentName = currentNode.name;

      if (parentName === 'Properties70') {

        this.parseNodeSpecialProperty(line, propName, propValue);
        return;

      }

      // Connections
      if (propName === 'C') {

        var connProps = propValue.split(',').slice(1);
        var from = parseInt(connProps[0]);
        var to = parseInt(connProps[1]);

        var rest = propValue.split(',').slice(3);

        rest = rest.map(function (elem) {

          return elem.trim().replace(/^"/, '');

        });

        propName = 'connections';
        propValue = [from, to];
        append(propValue, rest);

        if (currentNode[propName] === undefined) {

          currentNode[propName] = [];

        }

      }

      // Node
      if (propName === 'Node') currentNode.id = propValue;

      // connections
      if (propName in currentNode && Array.isArray(currentNode[propName])) {

        currentNode[propName].push(propValue);

      } else {

        if (propName !== 'a') currentNode[propName] = propValue;
        else currentNode.a = propValue;

      }

      this.setCurrentProp(currentNode, propName);

      // convert string to array, unless it ends in ',' in which case more will be added to it
      if (propName === 'a' && propValue.slice(-1) !== ',') {

        currentNode.a = parseNumberArray(propValue);

      }

    },

    parseNodePropertyContinued: function (line) {

      var currentNode = this.getCurrentNode();

      currentNode.a += line;

      // if the line doesn't end in ',' we have reached the end of the property value
      // so convert the string to an array
      if (line.slice(-1) !== ',') {

        currentNode.a = parseNumberArray(currentNode.a);

      }

    },

    // parse "Property70"
    parseNodeSpecialProperty: function (line, propName, propValue) {

      // split this
      // P: "Lcl Scaling", "Lcl Scaling", "", "A",1,1,1
      // into array like below
      // ["Lcl Scaling", "Lcl Scaling", "", "A", "1,1,1" ]
      var props = propValue.split('",').map(function (prop) {

        return prop.trim().replace(/^\"/, '').replace(/\s/, '_');

      });

      var innerPropName = props[0];
      var innerPropType1 = props[1];
      var innerPropType2 = props[2];
      var innerPropFlag = props[3];
      var innerPropValue = props[4];

      // cast values where needed, otherwise leave as strings
      switch (innerPropType1) {

        case 'int':
        case 'enum':
        case 'bool':
        case 'ULongLong':
        case 'double':
        case 'Number':
        case 'FieldOfView':
          innerPropValue = parseFloat(innerPropValue);
          break;

        case 'Color':
        case 'ColorRGB':
        case 'Vector3D':
        case 'Lcl_Translation':
        case 'Lcl_Rotation':
        case 'Lcl_Scaling':
          innerPropValue = parseNumberArray(innerPropValue);
          break;

      }

      // CAUTION: these props must append to parent's parent
      this.getPrevNode()[innerPropName] = {

        'type': innerPropType1,
        'type2': innerPropType2,
        'flag': innerPropFlag,
        'value': innerPropValue

      };

      this.setCurrentProp(this.getPrevNode(), innerPropName);

    },

  };

  // Parse an FBX file in Binary format
  function BinaryParser() {
  }

  BinaryParser.prototype = {

    constructor: BinaryParser,

    parse: function (buffer) {

      var reader = new BinaryReader(buffer);
      reader.skip(23); // skip magic 23 bytes

      var version = reader.getUint32();

      if (version < 6400) {

        throw new Error('THREE.FBXLoader: FBX version not supported, FileVersion: ' + version);

      }

      var allNodes = new FBXTree();

      while (!this.endOfContent(reader)) {

        var node = this.parseNode(reader, version);
        if (node !== null) allNodes.add(node.name, node);

      }

      return allNodes;

    },

    // Check if reader has reached the end of content.
    endOfContent: function (reader) {

      // footer size: 160bytes + 16-byte alignment padding
      // - 16bytes: magic
      // - padding til 16-byte alignment (at least 1byte?)
      //	(seems like some exporters embed fixed 15 or 16bytes?)
      // - 4bytes: magic
      // - 4bytes: version
      // - 120bytes: zero
      // - 16bytes: magic
      if (reader.size() % 16 === 0) {

        return ((reader.getOffset() + 160 + 16) & ~0xf) >= reader.size();

      } else {

        return reader.getOffset() + 160 + 16 >= reader.size();

      }

    },

    // recursively parse nodes until the end of the file is reached
    parseNode: function (reader, version) {

      var node = {};

      // The first three data sizes depends on version.
      var endOffset = (version >= 7500) ? reader.getUint64() : reader.getUint32();
      var numProperties = (version >= 7500) ? reader.getUint64() : reader.getUint32();

      (version >= 7500) ? reader.getUint64() : reader.getUint32(); // the returned propertyListLen is not used

      var nameLen = reader.getUint8();
      var name = reader.getString(nameLen);

      // Regards this node as NULL-record if endOffset is zero
      if (endOffset === 0) return null;

      var propertyList = [];

      for (var i = 0; i < numProperties; i++) {

        propertyList.push(this.parseProperty(reader));

      }

      // Regards the first three elements in propertyList as id, attrName, and attrType
      var id = propertyList.length > 0 ? propertyList[0] : '';
      var attrName = propertyList.length > 1 ? propertyList[1] : '';
      var attrType = propertyList.length > 2 ? propertyList[2] : '';

      // check if this node represents just a single property
      // like (name, 0) set or (name2, [0, 1, 2]) set of {name: 0, name2: [0, 1, 2]}
      node.singleProperty = (numProperties === 1 && reader.getOffset() === endOffset) ? true : false;

      while (endOffset > reader.getOffset()) {

        var subNode = this.parseNode(reader, version);

        if (subNode !== null) this.parseSubNode(name, node, subNode);

      }

      node.propertyList = propertyList; // raw property list used by parent

      if (typeof id === 'number') node.id = id;
      if (attrName !== '') node.attrName = attrName;
      if (attrType !== '') node.attrType = attrType;
      if (name !== '') node.name = name;

      return node;

    },

    parseSubNode: function (name, node, subNode) {

      // special case: child node is single property
      if (subNode.singleProperty === true) {

        var value = subNode.propertyList[0];

        if (Array.isArray(value)) {

          node[subNode.name] = subNode;

          subNode.a = value;

        } else {

          node[subNode.name] = value;

        }

      } else if (name === 'Connections' && subNode.name === 'C') {

        var array = [];

        subNode.propertyList.forEach(function (property, i) {

          // first Connection is FBX type (OO, OP, etc.). We'll discard these
          if (i !== 0) array.push(property);

        });

        if (node.connections === undefined) {

          node.connections = [];

        }

        node.connections.push(array);

      } else if (subNode.name === 'Properties70') {

        var keys = Object.keys(subNode);

        keys.forEach(function (key) {

          node[key] = subNode[key];

        });

      } else if (name === 'Properties70' && subNode.name === 'P') {

        var innerPropName = subNode.propertyList[0];
        var innerPropType1 = subNode.propertyList[1];
        var innerPropType2 = subNode.propertyList[2];
        var innerPropFlag = subNode.propertyList[3];
        var innerPropValue;

        if (innerPropName.indexOf('Lcl ') === 0) innerPropName = innerPropName.replace('Lcl ', 'Lcl_');
        if (innerPropType1.indexOf('Lcl ') === 0) innerPropType1 = innerPropType1.replace('Lcl ', 'Lcl_');

        if (innerPropType1 === 'Color' || innerPropType1 === 'ColorRGB' || innerPropType1 === 'Vector' || innerPropType1 === 'Vector3D' || innerPropType1.indexOf('Lcl_') === 0) {

          innerPropValue = [
            subNode.propertyList[4],
            subNode.propertyList[5],
            subNode.propertyList[6]
          ];

        } else {

          innerPropValue = subNode.propertyList[4];

        }

        // this will be copied to parent, see above
        node[innerPropName] = {

          'type': innerPropType1,
          'type2': innerPropType2,
          'flag': innerPropFlag,
          'value': innerPropValue

        };

      } else if (node[subNode.name] === undefined) {

        if (typeof subNode.id === 'number') {

          node[subNode.name] = {};
          node[subNode.name][subNode.id] = subNode;

        } else {

          node[subNode.name] = subNode;

        }

      } else {

        if (subNode.name === 'PoseNode') {

          if (!Array.isArray(node[subNode.name])) {

            node[subNode.name] = [node[subNode.name]];

          }

          node[subNode.name].push(subNode);

        } else if (node[subNode.name][subNode.id] === undefined) {

          node[subNode.name][subNode.id] = subNode;

        }

      }

    },

    parseProperty: function (reader) {

      var type = reader.getString(1);

      switch (type) {

        case 'C':
          return reader.getBoolean();

        case 'D':
          return reader.getFloat64();

        case 'F':
          return reader.getFloat32();

        case 'I':
          return reader.getInt32();

        case 'L':
          return reader.getInt64();

        case 'R':
          var length = reader.getUint32();
          return reader.getArrayBuffer(length);

        case 'S':
          var length = reader.getUint32();
          return reader.getString(length);

        case 'Y':
          return reader.getInt16();

        case 'b':
        case 'c':
        case 'd':
        case 'f':
        case 'i':
        case 'l':

          var arrayLength = reader.getUint32();
          var encoding = reader.getUint32(); // 0: non-compressed, 1: compressed
          var compressedLength = reader.getUint32();

          if (encoding === 0) {

            switch (type) {

              case 'b':
              case 'c':
                return reader.getBooleanArray(arrayLength);

              case 'd':
                return reader.getFloat64Array(arrayLength);

              case 'f':
                return reader.getFloat32Array(arrayLength);

              case 'i':
                return reader.getInt32Array(arrayLength);

              case 'l':
                return reader.getInt64Array(arrayLength);

            }

          }

          if (typeof Inflate === 'undefined') {

            console.error('THREE.FBXLoader: External library Inflate.min.js required, obtain or import from https://github.com/imaya/zlib.js');

          }

          var inflate = new Inflate(new Uint8Array(reader.getArrayBuffer(compressedLength))); // eslint-disable-line no-undef
          var reader2 = new BinaryReader(inflate.decompress().buffer);

          switch (type) {

            case 'b':
            case 'c':
              return reader2.getBooleanArray(arrayLength);

            case 'd':
              return reader2.getFloat64Array(arrayLength);

            case 'f':
              return reader2.getFloat32Array(arrayLength);

            case 'i':
              return reader2.getInt32Array(arrayLength);

            case 'l':
              return reader2.getInt64Array(arrayLength);

          }

        default:
          throw new Error('THREE.FBXLoader: Unknown property type ' + type);

      }

    }

  };

  function BinaryReader(buffer, littleEndian) {

    this.dv = new DataView(buffer);
    this.offset = 0;
    this.littleEndian = (littleEndian !== undefined) ? littleEndian : true;

  }

  BinaryReader.prototype = {

    constructor: BinaryReader,

    getOffset: function () {

      return this.offset;

    },

    size: function () {

      return this.dv.buffer.byteLength;

    },

    skip: function (length) {

      this.offset += length;

    },

    // seems like true/false representation depends on exporter.
    // true: 1 or 'Y'(=0x59), false: 0 or 'T'(=0x54)
    // then sees LSB.
    getBoolean: function () {

      return (this.getUint8() & 1) === 1;

    },

    getBooleanArray: function (size) {

      var a = [];

      for (var i = 0; i < size; i++) {

        a.push(this.getBoolean());

      }

      return a;

    },

    getUint8: function () {

      var value = this.dv.getUint8(this.offset);
      this.offset += 1;
      return value;

    },

    getInt16: function () {

      var value = this.dv.getInt16(this.offset, this.littleEndian);
      this.offset += 2;
      return value;

    },

    getInt32: function () {

      var value = this.dv.getInt32(this.offset, this.littleEndian);
      this.offset += 4;
      return value;

    },

    getInt32Array: function (size) {

      var a = [];

      for (var i = 0; i < size; i++) {

        a.push(this.getInt32());

      }

      return a;

    },

    getUint32: function () {

      var value = this.dv.getUint32(this.offset, this.littleEndian);
      this.offset += 4;
      return value;

    },

    // JavaScript doesn't support 64-bit integer so calculate this here
    // 1 << 32 will return 1 so using multiply operation instead here.
    // There's a possibility that this method returns wrong value if the value
    // is out of the range between Number.MAX_SAFE_INTEGER and Number.MIN_SAFE_INTEGER.
    // TODO: safely handle 64-bit integer
    getInt64: function () {

      var low, high;

      if (this.littleEndian) {

        low = this.getUint32();
        high = this.getUint32();

      } else {

        high = this.getUint32();
        low = this.getUint32();

      }

      // calculate negative value
      if (high & 0x80000000) {

        high = ~high & 0xFFFFFFFF;
        low = ~low & 0xFFFFFFFF;

        if (low === 0xFFFFFFFF) high = (high + 1) & 0xFFFFFFFF;

        low = (low + 1) & 0xFFFFFFFF;

        return -(high * 0x100000000 + low);

      }

      return high * 0x100000000 + low;

    },

    getInt64Array: function (size) {

      var a = [];

      for (var i = 0; i < size; i++) {

        a.push(this.getInt64());

      }

      return a;

    },

    // Note: see getInt64() comment
    getUint64: function () {

      var low, high;

      if (this.littleEndian) {

        low = this.getUint32();
        high = this.getUint32();

      } else {

        high = this.getUint32();
        low = this.getUint32();

      }

      return high * 0x100000000 + low;

    },

    getFloat32: function () {

      var value = this.dv.getFloat32(this.offset, this.littleEndian);
      this.offset += 4;
      return value;

    },

    getFloat32Array: function (size) {

      var a = [];

      for (var i = 0; i < size; i++) {

        a.push(this.getFloat32());

      }

      return a;

    },

    getFloat64: function () {

      var value = this.dv.getFloat64(this.offset, this.littleEndian);
      this.offset += 8;
      return value;

    },

    getFloat64Array: function (size) {

      var a = [];

      for (var i = 0; i < size; i++) {

        a.push(this.getFloat64());

      }

      return a;

    },

    getArrayBuffer: function (size) {

      var value = this.dv.buffer.slice(this.offset, this.offset + size);
      this.offset += size;
      return value;

    },

    getString: function (size) {

      // note: safari 9 doesn't support Uint8Array.indexOf; create intermediate array instead
      var a = [];

      for (var i = 0; i < size; i++) {

        a[i] = this.getUint8();

      }

      var nullByte = a.indexOf(0);
      if (nullByte >= 0) a = a.slice(0, nullByte);

      return LoaderUtils.decodeText(new Uint8Array(a));

    }

  };

  // FBXTree holds a representation of the FBX data, returned by the TextParser ( FBX ASCII format)
  // and BinaryParser( FBX Binary format)
  function FBXTree() {
  }

  FBXTree.prototype = {

    constructor: FBXTree,

    add: function (key, val) {

      this[key] = val;

    },

  };

  // ************** UTILITY FUNCTIONS **************

  function isFbxFormatBinary(buffer) {

    var CORRECT = 'Kaydara FBX Binary  \0';

    return buffer.byteLength >= CORRECT.length && CORRECT === convertArrayBufferToString(buffer, 0, CORRECT.length);

  }

  function isFbxFormatASCII(text) {

    var CORRECT = ['K', 'a', 'y', 'd', 'a', 'r', 'a', '\\', 'F', 'B', 'X', '\\', 'B', 'i', 'n', 'a', 'r', 'y', '\\', '\\'];

    var cursor = 0;

    function read(offset) {

      var result = text[offset - 1];
      text = text.slice(cursor + offset);
      cursor++;
      return result;

    }

    for (var i = 0; i < CORRECT.length; ++i) {

      var num = read(1);
      if (num === CORRECT[i]) {

        return false;

      }

    }

    return true;

  }

  function getFbxVersion(text) {

    var versionRegExp = /FBXVersion: (\d+)/;
    var match = text.match(versionRegExp);

    if (match) {

      var version = parseInt(match[1]);
      return version;

    }

    throw new Error('THREE.FBXLoader: Cannot find the version number for the file given.');

  }

  // Converts FBX ticks into real time seconds.
  function convertFBXTimeToSeconds(time) {

    return time / 46186158000;

  }

  var dataArray = [];

  // extracts the data from the correct position in the FBX array based on indexing type
  function getData(polygonVertexIndex, polygonIndex, vertexIndex, infoObject) {

    var index;

    switch (infoObject.mappingType) {

      case 'ByPolygonVertex' :
        index = polygonVertexIndex;
        break;
      case 'ByPolygon' :
        index = polygonIndex;
        break;
      case 'ByVertice' :
        index = vertexIndex;
        break;
      case 'AllSame' :
        index = infoObject.indices[0];
        break;
      default :
        console.warn('THREE.FBXLoader: unknown attribute mapping type ' + infoObject.mappingType);

    }

    if (infoObject.referenceType === 'IndexToDirect') index = infoObject.indices[index];

    var from = index * infoObject.dataSize;
    var to = from + infoObject.dataSize;

    return slice(dataArray, infoObject.buffer, from, to);

  }

  var tempEuler = new Euler();
  var tempVec = new Vector3();

  // generate transformation from FBX transform data
  // ref: https://help.autodesk.com/view/FBX/2017/ENU/?guid=__files_GUID_10CDD63C_79C1_4F2D_BB28_AD2BE65A02ED_htm
  // ref: http://docs.autodesk.com/FBX/2014/ENU/FBX-SDK-Documentation/index.html?url=cpp_ref/_transformations_2main_8cxx-example.html,topicNumber=cpp_ref__transformations_2main_8cxx_example_htmlfc10a1e1-b18d-4e72-9dc0-70d0f1959f5e
  function generateTransform(transformData) {

    var lTranslationM = new Matrix4();
    var lPreRotationM = new Matrix4();
    var lRotationM = new Matrix4();
    var lPostRotationM = new Matrix4();

    var lScalingM = new Matrix4();
    var lScalingPivotM = new Matrix4();
    var lScalingOffsetM = new Matrix4();
    var lRotationOffsetM = new Matrix4();
    var lRotationPivotM = new Matrix4();

    var lParentGX = new Matrix4();
    var lGlobalT = new Matrix4();

    var inheritType = (transformData.inheritType) ? transformData.inheritType : 0;

    if (transformData.translation) lTranslationM.setPosition(tempVec.fromArray(transformData.translation));

    if (transformData.preRotation) {

      var array = transformData.preRotation.map(MathUtils.degToRad);
      array.push(transformData.eulerOrder);
      lPreRotationM.makeRotationFromEuler(tempEuler.fromArray(array));

    }

    if (transformData.rotation) {

      var array = transformData.rotation.map(MathUtils.degToRad);
      array.push(transformData.eulerOrder);
      lRotationM.makeRotationFromEuler(tempEuler.fromArray(array));

    }

    if (transformData.postRotation) {

      var array = transformData.postRotation.map(MathUtils.degToRad);
      array.push(transformData.eulerOrder);
      lPostRotationM.makeRotationFromEuler(tempEuler.fromArray(array));

    }

    if (transformData.scale) lScalingM.scale(tempVec.fromArray(transformData.scale));

    // Pivots and offsets
    if (transformData.scalingOffset) lScalingOffsetM.setPosition(tempVec.fromArray(transformData.scalingOffset));
    if (transformData.scalingPivot) lScalingPivotM.setPosition(tempVec.fromArray(transformData.scalingPivot));
    if (transformData.rotationOffset) lRotationOffsetM.setPosition(tempVec.fromArray(transformData.rotationOffset));
    if (transformData.rotationPivot) lRotationPivotM.setPosition(tempVec.fromArray(transformData.rotationPivot));

    // parent transform
    if (transformData.parentMatrixWorld) lParentGX = transformData.parentMatrixWorld;

    // Global Rotation
    var lLRM = lPreRotationM.multiply(lRotationM).multiply(lPostRotationM);
    var lParentGRM = new Matrix4();
    lParentGX.extractRotation(lParentGRM);

    // Global Shear*Scaling
    var lParentTM = new Matrix4();
    lParentTM.copyPosition(lParentGX);

    var lParentGSM = new Matrix4();
    lParentGSM.getInverse(lParentGRM).multiply(lParentGX);

    var lGlobalRS = new Matrix4();

    if (inheritType === 0) {

      lGlobalRS.copy(lParentGRM).multiply(lLRM).multiply(lParentGSM).multiply(lScalingM);

    } else if (inheritType === 1) {

      lGlobalRS.copy(lParentGRM).multiply(lParentGSM).multiply(lLRM).multiply(lScalingM);

    } else {

      var lParentLSM_inv = new Matrix4().getInverse(lScalingM);
      var lParentGSM_noLocal = new Matrix4().multiply(lParentGSM).multiply(lParentLSM_inv);

      lGlobalRS.copy(lParentGRM).multiply(lLRM).multiply(lParentGSM_noLocal).multiply(lScalingM);

    }

    var lRotationPivotM_inv = new Matrix4().getInverse(lRotationPivotM);
    var lScalingPivotM_inv = new Matrix4().getInverse(lScalingPivotM);
    // Calculate the local transform matrix
    var lTransform = new Matrix4();
    lTransform.copy(lTranslationM).multiply(lRotationOffsetM).multiply(lRotationPivotM).multiply(lPreRotationM).multiply(lRotationM).multiply(lPostRotationM).multiply(lRotationPivotM_inv).multiply(lScalingOffsetM).multiply(lScalingPivotM).multiply(lScalingM).multiply(lScalingPivotM_inv);

    var lLocalTWithAllPivotAndOffsetInfo = new Matrix4().copyPosition(lTransform);

    var lGlobalTranslation = new Matrix4().copy(lParentGX).multiply(lLocalTWithAllPivotAndOffsetInfo);
    lGlobalT.copyPosition(lGlobalTranslation);

    lTransform = new Matrix4().multiply(lGlobalT).multiply(lGlobalRS);

    return lTransform;

  }

  // Returns the three.js intrinsic Euler order corresponding to FBX extrinsic Euler order
  // ref: http://help.autodesk.com/view/FBX/2017/ENU/?guid=__cpp_ref_class_fbx_euler_html
  function getEulerOrder(order) {

    order = order || 0;

    var enums = [
      'ZYX', // -> XYZ extrinsic
      'YZX', // -> XZY extrinsic
      'XZY', // -> YZX extrinsic
      'ZXY', // -> YXZ extrinsic
      'YXZ', // -> ZXY extrinsic
      'XYZ', // -> ZYX extrinsic
      //'SphericXYZ', // not possible to support
    ];

    if (order === 6) {

      console.warn('THREE.FBXLoader: unsupported Euler Order: Spherical XYZ. Animations and rotations may be incorrect.');
      return enums[0];

    }

    return enums[order];

  }

  // Parses comma separated list of numbers and returns them an array.
  // Used internally by the TextParser
  function parseNumberArray(value) {

    var array = value.split(',').map(function (val) {

      return parseFloat(val);

    });

    return array;

  }

  function convertArrayBufferToString(buffer, from, to) {

    if (from === undefined) from = 0;
    if (to === undefined) to = buffer.byteLength;

    return LoaderUtils.decodeText(new Uint8Array(buffer, from, to));

  }

  function append(a, b) {

    for (var i = 0, j = a.length, l = b.length; i < l; i++, j++) {

      a[j] = b[i];

    }

  }

  function slice(a, b, from, to) {

    for (var i = from, j = 0; i < to; i++, j++) {

      a[j] = b[i];

    }

    return a;

  }

  // inject array a2 into array a1 at index
  function inject(a1, index, a2) {

    return a1.slice(0, index).concat(a2).concat(a1.slice(index));

  }

  return FBXLoader;

})();

export {FBXLoader};
